class_docstr: A memoizing mapping that retains `capacity` deleted items
  
  The memo tracks retained items by their access order; once `capacity` items
  are retained, the least recently used item is discarded.
code: def clear(self):
      self._active.clear()
      self._memory.clear()
  
imports: import inspect
  import warnings
  import types
  import collections
  import itertools
  from functools import lru_cache, wraps
  from typing import Callable, List, Union, Iterable, TypeVar, cast
label_desc: Use image node_id 5 for calling the LRUMemo obj's underlying member method code with example usage: obj.clear() without return types